Texas Instruments Corporation

Rockwell Collins, Inc.

Mark Philip Swenholt

Jeffrey L Box

Ronald Persson

Les Priebe

An adaptive recursive filter is disclosed. The filter includes a filtering device to iteratively apply a recursive filter to signal frames corresponding to portions of a sampled broadband signal. Each iteration of the recursive filter may include generating an autocorrelation signal of an input signal frame, calculating a ratio of a magnitudes of a pair of successive points of the autocorrelation signal, comparing the ratio to a selected signal detection threshold such that a value of the ratio greater than a threshold indicates at least one signal of interest, calculating an energy-weighted average frequency of the input signal frame as a frequency of interest, comparing a spectral energy of the input signal frame at the frequency of interest to spectral energies of surrounding frequencies to identify a frequency of a narrowband interference signal, and filtering the input signal frame at the identified frequency to remove the identified narrowband interference signal.

Adaptive filter with recursive processing

A method of resolving the frequency ambiguities which result when the instantaneous bandwidth of a digital receiver exceeds the sampling frequency of the digital to analog converter. The frequency ambiguities which result from sampling an input signal below the Nyquist rate are resolved by simultaneously sampling the signal at multiple sample frequencies and then using a lookup table to identify the unique mapping of the common signal into the multiple sample frequency baselines.

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Plano, TX, United States of America

Mark Philip Swenholt